From MeritBadgeDotOrg

The unit committee chairman is appointed by the chartered organization and registered as an adult leader of the BSA. The troop committee chairman appoints and supervises the unit committee and unit leaders.

Online or classroom Leader Training

Youth Protection training (YPT) is required for all BSA registered volunteers and must be retaken every two years. Some councils and units may require more frequent (e.g., annual) retaking of YPT). Check with your local council and unit to find out what their policies are.